| 摘要 |
A screw extruder comprises an extruder body ( 4 ) with a bore ( 4 H), and a screw ( 5 ) rotatably disposed in the bore ( 4 H). The screw ( 5 ) comprises a screw shaft ( 7 ) and two screw flights ( 8 and 9 ) disposed in the form of a double helix. The screw flight ( 9 ) is substantially continuous, but the screw flight ( 8 ) is provided with large interruptions ( 11 ) within which a plurality of additional flight pieces ( 13 ) are disposed to change the number of passages repeatedly. Mixing/kneading pins ( 15 ) protruding into the bore ( 4 H) can be provided. Preferably, the paths ( 17 ) for the mixing/kneading pins ( 15 ) are positioned within the interruptions ( 11 ) and on the upstream side and downstream side of the additional flight pieces ( 13 ).
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